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HEAT TREATMENT.
281
It will be seen that annealing has almost wiped away the ations in each heat, 'and it is therefore quite certain that the differences lie in the rolling history.   The true way of testing the
TABLE XV-Gk
Showing that Eolled Plates of the same Acid Open-Hearth Heat, which show Wide Variations in their Physical Properties, are made alike by Annealing.
M OTK.—In each case, A is the test giving the highest tensile strength of any plate
in the heat, and JS is the one giving the lowest.  Carbon was
determined hy color and is therefore not reliable.
Heat number.	Thickness of plates.	Condition of test bar.	Test mark.	Ultimate strength ; pounds per square inch.	Elastic limit; pounds per square inch.	Elongation in 8 inches ; per cent.	Reduction of area; per cent.	Bias tic ratio ; per cent.	Chemical composition; percent.			
									C.	P.	Mn.	S.
6688	i	Natural Natural Annealed Annealed	A B A B	61000 66480 47750 46970	68200 46800 29980 80690	21.50 25.26 34.50 85.00	61.9 60.0 67.0 64.5	87.2 82.0 62.8 65.3	.16 .12	.015 .015	.82 .81	.022 .019
												
												
6668	i	Natural Natural Annealed Annealed	A B A B	65870 60880 62160 60260	62560 48800 82450 88840	21.75 21.50 82.00 82.50	58.7 61.1 57.0 62.6	80.4 80.8 62.2 66.8	.14 .10	.009 .012	.46 .45	.025 .020
												
												
8217	i	Natural Natural Annealed Annealed	A B A B	64620 59960 52820 60000	58140 48490 85450 81840	25.00 21.50 27.00 81.50	58.1 45.5 62.2 56.4	82.2 80.9 67.1 63.7	.16 .14	.021 .016	.44 .44	.081 .025
												
												
8226	i	Natural Natural Annealed Annealed	A B A B	64260 57040 54070 58960	54870 89990 88520 88520	21.00 28.75 27.50 29.50	50.6 56.6 64.4 68.8	84.6 70.1 71.2 71.4	.12 .12	.086 .084	.84 .82	:.058 .047
												
												
8281	A	Natural Natural Annealed Annealed	A B A B	64480 61100 58880 62180	60560 45030 84870 88780	26.00 26.00 81.25 84.25	68.8 48.0 61.9 68.2	78.4 78.7 64.8 64.7	.13 .11	.021 .018	.55 .51	.048 .044
												
												
8288	i	Natural Natural Annealed Annealed	A B A B	66860 58160 62760 51480	69100 47680 86940 ,40480	20.75 24.50 88.00 28.75	62.7 60.8 65.0 66.0	89.1 81.9 70.0 78.6	.11 .11	.026 .020	.87 .39	.083 .028
												
												
8284	A'	Natural Natural Annealed Annealed	A B A B	66800 61860 56560 54038	49440 47980 87860 84443	20.75 27.00 28.25 81.75	67.5 61.7 60.0 68.7	74.6 78.1 67.2 63.7	.15 .14	.024 , .021	.49 .47	.022 .023
												
												
8285	i	Natural Natural Annealed Annealed	A B A B	68220 58240 47740 47600	68800 47680 29980 80580	18.50 21.25 88.25 84.00	54.9 58.5 63.9 67.2	92.2 81.8 62.7 64.1	.10 .11	.017 .017	.88 .35	.035 .034
											.46 .45	~087 .022
82%	A	Natural Natural Annealed Annealed	A B A B	64020 58720 58860 50660	49510 42960 88710 82710	23.25 80.25 29.25 85.00	68.1 60.0 68.6 64.7	77.8 78.2 62.6 64.6	.11 .13	.025 .017		
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